premeditated murder of 270 innocent people and let them walk away from their prison term. sorry, it's just not -- it's just not just, and it's not fair. >> reporter: u.s. officials agreed. >> we believe that he should spend the rest of his time in jail. >> reporter: but in britain, a dying prisoner can qualify for compassionate release. last week, the infamous great train robber ronnie biggs was freed, aged 80 and suffering from pneumonia. and some british relatives of the lockerbie dead believe megrahi should go free. they don't believe he was guilty in the first place. >> i think it would be inhumane, indeed, downright cruel, to keep the man in prison to die, away from his family and his country. >> reporter: scottish authorities believe megrahi has just months to live. the question, will he spend those last few months a free man or a prisoner? nick watt, abc news, london.